docs: def javascript_tag(self, *args):
          """
          Convenience tag to output 1 or more javascript tags.
  
          :param args: 1 or more javascript file names
          :return: Script tag(s) containing the asset
          """
          tags = []
  
          for arg in args:
              asset_path = self.asset_url_for('{0}.js'.format(arg))
              if asset_path:
                  tags.append('<script src="{0}"></script>'.format(asset_path))
  
          return '\n'.join(tags)